Shining light on circumstantial evidence.
Lord Cairns in the case of Belhaven & Stenton Peerage:
… My Lords, in dealing with circumstantial evidence we have to consider the weight which is to be given to the united force of all the circumstances put together. You may have a ray of light so feeble that by itself it will do little to elucidate a dark corner. But on the other hand you may have a number of rays, each of them insufficient, but all converging and brought to bear upon the same point, and when united, producing a body of illumination which will clear away the darkness which you are endeavouring to dispel.